Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c5dfc689c94690…

MALICIOUS

PDF

35.9 KB Created: 2021-07-05 15:16:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6c1cd66cab63de8b45cfa0b4146cfb6d SHA-1: 68077ef7c1ad8dd17d28bd63c98baaaaa9efdf59 SHA-256: 25c5dfc689c94690d28d0a6606038068852456c7fe16d15b32cb6139fa7cdce5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and cheats. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-apk-mod-hack-download-game-hack, which is flagged as a malicious redirector. The document body and embedded URLs reinforce this theme, aiming to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/406889139/coin-master-apk-mod-hack-download-game-hack In PDF document text
    • https://www.yuko.com.tw/upload/files/row-blocks-free-games-at-robloxcom_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/robux-hack-2021-apk-download_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/ff-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/how-to-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/how-do-you-make-a-shirt-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/how-to-get-free-robux-no-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/best-way-to-get-free-and-easy-robux-fast_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/how-to-put-hack-script-to-roblox-parkour_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/the-app-that-gives-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • https://www.yuko.com.tw/upload/files/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33C1 23368 bytes
SHA-256: 42ad9e0633094cd2635fae572152fecf28fab996cf15ac7c6804d13f399dfeb1
font_01_sfnt_off00006845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6845 18760 bytes
SHA-256: 37c2e3d0ff89121a17535d311000bc752ef36473df10faf2b1aa681f69ceff3e

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